Should I remove old attic insulation before adding new?

• <div><p>Ideally, you can add new insulation to your existing insulation. However, some circumstances require you to remove old insulation before adding any new insulation: </p><ul><li><p>If the insulation is over 15 years old</p></li><li><p>If the insulation is wet or moldy</p></li><li><p>If it is <a href="https://www.angi.com/articles/what-is-vermiculite-insulation.htm">vermiculite insulation</a></p></li><li><p>If you see signs of pest infestation</p></li></ul><p>Removing old insulation is best left to a pro who can safely dispose of potential moldy or asbestos-ridden insulation.</p></div>

Can I use fiberglass insulation to soundproof a room?

• <div><p>We do not recommend fiberglass insulation for soundproofing purposes, especially if you are working on a room that’s part of your living space. <a href="https://www.angi.com/articles/diy-dangers-fiberglass-insulation-hazards.htm">Fiberglass insulation is dangerous</a>, and the installation process is hazardous. It is also harmful to the environment. When there are so many newer, healthier non-fiberglass alternatives in the market, the lower cost of fiberglass insulation simply doesn’t justify the harm and danger it poses.</p></div>

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Last update on November 09, 2025

Reviewed in November 2025
Great communication, replied promptly, did work quickly & cleaned up afterwards. Reasonable, Upfront cost & worked around my schedule. Installed new outlet in my bathroom & covered an outlet that was partially obstructed by a bookcase & installed a new one that I can use next to it. I will hire...
Marco Flores Electric
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Reviewed in January 2025
The owner called back quickly and had his installer on with us and answered my questions and sent a Tech out right away! Mike, the Tech was great, knowledgeable personable and very professional. We will always be using them in the future!
California HVAC Partners, Inc.
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Reviewed in August 2024
Great install, it was quick and best quote than the competitors.
Craven Landscaping, Inc.
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Reviewed in June 2024
Installed a Charge Point EV charger in my garage. Excellent work and quick service. Experienced and very competent.
SPARKS ELECTRICAL SOLUTIONS INC
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Reviewed in November 2023
I hired them for an exterior door installation project. It turned out beautifully. Great work. Fair pricing. Very professional. Highly recommend.
Gamez 7 Construction Inc.
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Reviewed in October 2023
Floor installation will begin today.
Floor Coverings International Monterey Bay
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Reviewed in July 2023
When our sales representative demonstrated the quality, durability and functionality of the windows we were thoroughly impressed but somewhat hesitant in committing to this significant purchase. After signing the contract the company followed up immediately with measurements, scheduling and...
Renewal by Andersen of Central CA
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Reviewed in December 2022
Sayed and his two courteous associates installed a new furnace and air conditioner. They were efficient and neat. They even installed a new Nest thermostat and showed me how to operate it I highly recommend them
411 Heating & AC, LLC
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Reviewed in March 2022
Reasonable quote with minimal delay, showed up right on time, 3 workers including the senior super expert installed the difficult new door with creativity and energy, always glad to brief us on how it was going. 4 hours and we are happiness!
Pulido's Overhead Door
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Reviewed in January 2022
I first engaged this Company with a need to get new garage-door springs installed. The technician arrived earlier than scheduled and did a great job. He also spent time trying to sort out my old garage-door motor. He notified me that it was in poor shape and took the time to explain the problem....
Overhead Door Co. of Salinas
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Doorbell Installation questions, answered by experts

You don’t need to staple insulation, as your drywall and studs will hold it into place. But if you already have a staple gun and staples lying around, it can help keep the product in place and avoid any shifting. But, most experts agree it’s an unnecessary step.

If you’re adding a vapor barrier, you will need to staple that in place.

Each of the three types of wool insulation has particular disadvantages. While their R-value is higher, they all cost more than fiberglass versions. Installing mineral wool and sheep wool requires protective gear. Because of its vulnerability to insects, chemicals are used in its production. Hemp wool is more costly to install than other types because additional tools and labor are involved.

Professionals can install a radiant barrier in a day or two, but DIY installation will take several days. The time it takes to install a radiant barrier depends largely on the size of the space and the installation method. Larger homes can take a pro two to three days to finish the job. It’s also quicker to lay foil over existing insulation.

Ideally, you can add new insulation to your existing insulation. However, some circumstances require you to remove old insulation before adding any new insulation:

If the insulation is over 15 years old
If the insulation is wet or moldy
If it is vermiculite insulation
If you see signs of pest infestation

Removing old insulation is best left to a pro who can safely dispose of potential moldy or asbestos-ridden insulation.

We do not recommend fiberglass insulation for soundproofing purposes, especially if you are working on a room that’s part of your living space. Fiberglass insulation is dangerous, and the installation process is hazardous. It is also harmful to the environment. When there are so many newer, healthier non-fiberglass alternatives in the market, the lower cost of fiberglass insulation simply doesn’t justify the harm and danger it poses.

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